refactor: migrate git_service to TypeScript
This MR migrates three files to TypeScript and sets up tsconfig.json and .eslintrc.json to compile and static check the TS code.
The diff count looks large, but without package-lock.json it is only +171 -116 change. All significant changes are described directly on the diff.
Previous work:
- test: cover git service with tests
- refactor: move methods in GitService class and log git errors
- Prepare GitService related code for TS migration
Closes #219 (closed)
Edited by Tomas Vik